Applicare la formula: $a=b$$\to b=a$, dove $a=x$ e $b=\sqrt{y-1}$

Applicare la formula: $x^a=b$$\to \left(x^a\right)^{inverse\left(a\right)}=b^{inverse\left(a\right)}$, dove $a=\frac{1}{2}$, $b=x$, $x^a=b=\sqrt{y-1}=x$, $x=y-1$ e $x^a=\sqrt{y-1}$

Applicare la formula: $\left(x^a\right)^b$$=x$, dove $a=\frac{1}{2}$, $b=2$, $x^a^b=\left(\sqrt{y-1}\right)^2$, $x=y-1$ e $x^a=\sqrt{y-1}$

Applicare la formula: $x+a=b$$\to x=b-a$, dove $a=-1$, $b=x^2$, $x+a=b=y-1=x^2$, $x=y$ e $x+a=y-1$

Applicare la formula: $ab$$=ab$, dove $ab=- -1$, $a=-1$ e $b=-1$